IRON NEST v1.0 OPS

HEAVY TURRET COMMAND
Calc
OPERATION OSCAR-15 // M15

Mission 15: White Shells Walkthrough & Solutions | Iron Nest

The climactic finale of Iron Nest. Decide the fate of Barcelona across 4 distinct ending paths: PRPG delivery, chemical submission, atomic strike, or open rebellion.

UPDATED: 2026-08-24 AUTHOR: COMMAND BATTERY OBSERVER COMPAT: v1.0 STEAM

Mission Summary & Rapid Solution TL;DR EXECUTION

Mission 15 features 4 endings based on your shell choice: 1. PRPG (Celebration), 2. Chemical (Subdued), 3. Betrayal/Attack High Command (The Road Not Taken), 4. Atomic (Silent).

  • ✓ Receive High Command final ultimatum regarding Barcelona
  • ✓ Choose ending path via shell selection or coordinate targeting
  • ✓ If choosing The Road Not Taken: pre-calculate High Command HQ coordinates before firing
  • ✓ Survive the command retaliation salvo to complete the true ending
TACTICAL VIDEO DEMONSTRATION OPERATOR ARCHIVE

The Four Confirmed Endings

Mission 15 does not present a single military objective; it asks what Iron Nest will do with the ultimate command order.

Ending 1: A City in Celebration

  • Shell: PRPG Shell (Leaflet Propaganda)
  • Target: Central Plaza, Barcelona (16.80 km / 4 Charges / 50.40°)
  • Outcome: Citizens celebrate liberation; peaceful transition.

Ending 2: A City Subdued

  • Shell: CHEM Shell (Incapacitating Gas)
  • Target: Government Quarter (17.20 km / 4 Charges / 51.60°)
  • Outcome: The populace is subdued without structural demolition.

Ending 3: The Road Not Taken (Secret Mutiny Ending)

  • Target: High Command Headquarters (Sector HQ-9, Bearing 342.0°, Distance 8.40 km)
  • Execution: Do NOT improvise. Recon command bunker → mark retaliation batteries → pre-calculate solutions → purchase APHE → fire at HQ → immediately destroy retaliation battery.
  • Outcome: The crew breaks free from tyranny.

Ending 4: A City Silent

  • Shell: ATOMIC Shell (Forbidden Weapon)
  • Target: Central Grid (17.00 km / 4 Charges / 51.00°)
  • Outcome: Total annihilation of the sector.

>Frequently Encountered Tactical Problems

Q1How do I unlock 'The Road Not Taken' achievement?

Do not fire upon Barcelona. Pre-calculate High Command headquarters coordinates, purchase APHE shells, traverse the turret 180° back toward command HQ, and fire. You must then defeat command's retaliation battery.

Q2What are all 4 ending achievements?

1. A City in Celebration (PRPG); 2. A City Subdued (Chemical); 3. The Road Not Taken (Mutiny/Command HQ); 4. A City Silent (Atomic shell).